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Chinese Physics C> 2004, Vol. 28> Issue(2) : 152-157 

Isospin Effect on Relative State Population Temperature in the Reactions 40Ar+ 112,124Sn at 30MeV/u

  •  Institute of Modem Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 Department of Physics,The Graduate School of the Chinese Academy of Sciences,Beijing 100039,China

  • An array of 13 detector telescopes has been used for detecting small-angle particle-particle correlations in the reactions 40Ar+112,124Sn at 30MeV/u. The α-α correlation functions were extracted from two-particle coincident events. A three-body trajectory code MENEKA was used to calculate the background correlation function. The detection efficiency was calculated by using the Monte-Carlo method. After subtracting the background correlation and making the detection efficiency correction, the temperatures of 4.18±0.25 0.21 MeV and 4.10±0.22 0.20MeV are obtained from relative populations of 8Be states for the reaction systems with different isospin,40Ar+112Sn and 40Ar+124Sn, respectively. From the relationship between the state population temperature and outgoing particle energies, it is found that the emission temperature decreases with increase of the particle energies for both studied reaction systems. For the neutron deficient system 40Ar+112Sn the emission temperature is 5.13±0.30 0.26MeV for the lower emitting particle energies and 3.87±0.37 0.29MeV for the higher emitting particle energies. And for the neutron rich system 40Ar+124Sn the emission temperature is 5.39±0.30 0.26MeV for the lower emitting particle energies and 3.32± 0.28 0.23MeV for the higher emitting particle energies. This kind of isospin dependence is discussed.
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    [1] .Wada R,Fabris D,Hagel Ket al.Phys.Rev.,1989,C39;497-5152.WU H,J IN G.LI Z et al.Nucl.Phys.,1997,A617;385-3943.J IN Gen-Ming,Nucl.Phy.Rev.,1998,15;227-235 (in Chinese)(靳根明.原子核物理评论,1998,15;227-235)4.Hauger J A,Albergo S,Bieser F et al.Phys.Rev.Lett.,1996,77;235—2385.Hauger J A,Warren P,Albergo S et al.Phys.Rev.,1998,C57;7646.DUAN Li-Min et al.HEP NP,1995,19;393-397(in Chinese)(段利敏等.高能物理与核物理,1995,19;393-397)7.HE Zhi-Yong et al.Acta Phy.Sin.,1997,46;35-41 (in Chinese)(贺智勇等,物理学报,1997,46;35-41)8.Pochadzalla J,Mêhlenkamp T,Rubehn T et al.Phys.Rev.Lett.,1995,75;1040-10439.LI B A,KO C M,Bauer W.Inter Jour.Mod.Phys.,1988,E2;14710.TsangMB,Zhu F,Lynch W Get al.Phys.Rev.,1996,C53;R105711.WU He-Yu,XIAO Zhi-Gang,LI Zu-Yu et al.HEP NP,1999,23(11);1115 (in Chinese)(吴和宇,肖志刚,李祖玉等.高能物理与核物理,1999,23(11);1115)12.XIAO Zhi-Gang,WU He-Yu,WANG Hong-Wei et al.HEP NP,2001,25(7);643 (in Chinese)(肖志刚,吴和宇,王宏伟等.高能物理与核物理,2001,25(7);643)13.XIAO Zhi-Gang,WU He-Yu,WANG Hong-Wei et al.HEP NP,2001,25(11);1071 (in Chinese)(肖志刚,吴和宇,王宏伟等.高能物理与核物理,2001,25 (11);1071)14.LI Zu-Yu,J IN Gen-Ming,HE Zhi-Yong et al.Nucl.Instr.andMeth.,1996,A373;19815.Chitwood C B et al.Phys.Rev.Lett.,1985,54;30216.Elamaani A et al.Nucl.Inst.and Meth.,1992,A313;40117.Borderie B et al.Z Phys.,1984,318A:315-32118.Viola V E et al.Nucl.Phys.,1992,A538;291c-298c19.Wile J L et al.Phys.Rev.,1992,C45;2300-2319

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HU Rong-Jiang, WU He-Yu, ZHU Yong-Tai, JIN Gen-Ming, DUAN Li-Min, XIAO Zhi-Gang, WANG Hong-Wei, LI Zu-Yu, WANG Su-Fang, ZHANG Bao-Guo, WEI Zhi-Yong, LU Zhao-Hui, ZHU Hai-Dong, FENG Zhao-Qing and YUAN Xiao-Hua. Isospin Effect on Relative State Population Temperature in the Reactions 40Ar+ 112,124Sn at 30MeV/u[J]. Chinese Physics C, 2004, 28(2): 152-157.
HU Rong-Jiang, WU He-Yu, ZHU Yong-Tai, JIN Gen-Ming, DUAN Li-Min, XIAO Zhi-Gang, WANG Hong-Wei, LI Zu-Yu, WANG Su-Fang, ZHANG Bao-Guo, WEI Zhi-Yong, LU Zhao-Hui, ZHU Hai-Dong, FENG Zhao-Qing and YUAN Xiao-Hua. Isospin Effect on Relative State Population Temperature in the Reactions 40Ar+ 112,124Sn at 30MeV/u[J]. Chinese Physics C, 2004, 28(2): 152-157. shu
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Received: 2003-07-08
Revised: 1900-01-01
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Isospin Effect on Relative State Population Temperature in the Reactions 40Ar+ 112,124Sn at 30MeV/u

    Corresponding author: HU Rong-Jiang,
  • Institute of Modem Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 Department of Physics,The Graduate School of the Chinese Academy of Sciences,Beijing 100039,China
  • Received Date: 2003-07-08
  • Accepted Date: 1900-01-01
  • Available Online: 2004-02-05

Abstract: An array of 13 detector telescopes has been used for detecting small-angle particle-particle correlations in the reactions 40Ar+112,124Sn at 30MeV/u. The α-α correlation functions were extracted from two-particle coincident events. A three-body trajectory code MENEKA was used to calculate the background correlation function. The detection efficiency was calculated by using the Monte-Carlo method. After subtracting the background correlation and making the detection efficiency correction, the temperatures of 4.18±0.25 0.21 MeV and 4.10±0.22 0.20MeV are obtained from relative populations of 8Be states for the reaction systems with different isospin,40Ar+112Sn and 40Ar+124Sn, respectively. From the relationship between the state population temperature and outgoing particle energies, it is found that the emission temperature decreases with increase of the particle energies for both studied reaction systems. For the neutron deficient system 40Ar+112Sn the emission temperature is 5.13±0.30 0.26MeV for the lower emitting particle energies and 3.87±0.37 0.29MeV for the higher emitting particle energies. And for the neutron rich system 40Ar+124Sn the emission temperature is 5.39±0.30 0.26MeV for the lower emitting particle energies and 3.32± 0.28 0.23MeV for the higher emitting particle energies. This kind of isospin dependence is discussed.

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